Airplane



FIG. 1 is a front, right perspective view of an airplane, showing my design;

FIG. 2 is right elevational view thereof;

FIG. 3 is a top, right perspective view thereof;

FIG. 4 is a top, front perspective view thereof; and,

FIG. 5 is a top elevational view thereof. 

The ornamental design for an airplane, as shown and described. 